+1 on scrap the chemi clean idea. Its just more chemicals, plus if you dont change anything its just going to come right back.
CyanoBacteria wont grow where there is good water movement. You need to to a water change but right before you syphon the water, puff the cyano off with a turkey baster to get it off the rocks & floating then suck it out with the water change.
Then you need to add a few powerheads in the tank to get the water moving all around the tank.
Here is a good artical on cyano.
http://netclub.athiel.com/cyano/cyanos2.htm